DOCS: support tagfile-susv4.xml with bzip2 compression
DOCS: force bzip2 uncompression
UI: document WidgetImpl::requisition methods
UI: document widget flags
UI: document widget allocation methods
DOCS: fix Doxygen-1.8.4 to ignore static_assert() variants
RCORE: minor docu fixup
RCORE: clarify docs for environment variables
UI: enable doxygen comments for key symbols
UI: provide working keysymdef.h URL
UI: small Widget docu updates
DOCS: ui/sinfeximpl.hh does not contain public API
DOCS: hide .cc enum definitions
UI: document KeyValue
DOCS: DOXYGEN_NEWS_SED: fix release news section numbering
DOCS: mkrelease.sh: use unwrapped message body to fix some commit messages
DOCS: use toplevel ChangeLog for documentation generation
DOCS: add extra CSS to documentation to fix up fonts and more
Merge branch 'docs'

* docs:
  DOCS: add extra CSS to documentation to fix up fonts and more
  DOCS: use toplevel ChangeLog for documentation generation
  DOCS: mkrelease.sh: use unwrapped message body to fix some commit messages
  DOCS: DOXYGEN_NEWS_SED: fix release news section numbering
  UI: document KeyValue
  DOCS: hide .cc enum definitions
  DOCS: ui/sinfeximpl.hh does not contain public API
  UI: small Widget docu updates
  UI: provide working keysymdef.h URL
  UI: enable doxygen comments for key symbols
  RCORE: clarify docs for environment variables
  RCORE: minor docu fixup
  DOCS: fix Doxygen-1.8.4 to ignore static_assert() variants
  UI: document widget allocation methods
  UI: document widget flags
  UI: document WidgetImpl::requisition methods
  DOCS: force bzip2 uncompression
  DOCS: support tagfile-susv4.xml with bzip2 compression
DOCS: adapt upload path to new testbit fs layout